attic insulation identification

Hi I am, trying to identify some insulation in a home that was built in 1910. There is no access to the attic except for a small opening in the bathroom where an exhaust vent is installed. I was able to pop my head through and looks like 6-7 inches of insulation. I am not exactly sure, so I was hoping someone might be able to ID it for me. I have attached a pic. It's kind of wool like and fibrous.
Thanks

attic insulation identification

I don't know how they got up there to insulate as the only opening I have found is in the bathroom where the ceiling fan is. I am surprised that there is 6" of insulation. It's hot in the summer and cooler in the winter on the 2nd floor.

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